Method of and apparatus for combining strands



April 19, 1938. H. s; KEATING 2,114,496

. rmaon OF AND APPARATUS FOR commune STRANDS Filed July 9, 1936 2 Sheet-Sheet 1 FIG./

INVE'IVTOA H. S. KEA TING RMW A TTORNEY April 1938. H. s. KEATING 2,114,496

METHOD OF AND APPARATUS FOR COMBINING STRANDS Filed July 9, 1936 2 Sheets-Sheet 2 \\\\\\\\\&\\3\\\\\\\\\\\\\\\\\\\\ 2% !Q I )wnv TOR /5 I6 I5 H. s. KEA mm A TTORNEY Patented Apr. 19, 1938 UNlT ED STATES msas'ros roai comsm'rnon or AND DINING BTRANDS Herbert S. Keating, North Plainiield. N. 1., aasignor to Western Electric Company, Incorporated, New York, N. Y., a corporation of New York Application July 9, loss, Serial No. 89,814 21 Claims. (01. 117-34) This invention relates to a method of. and apparatus forcombining strands and more par-' ticularlyto a method of and apparatus for inter- .twisting strands with predetermined cyclic varia- 6 tions of lay.

In the manufacture of electric cables, especially such as are used in the communications arts, it may in some cases be desirable to adjust the capacitance relation or properties of individual 9 strands with respect to other individual strands. This is accomplished in some instances by con necting to the pair of the strands in question a length of a pair of tightly coiled mutually insulated strands. One method of manufacturing such capacitance balancing units, as they may be called, is to intertwist two appropriate strands in such fashion that they are twisted together. with a non-conductlve core strand, with a very short pitch of lay in a close double helix for a predem termined distance and then for another predetermined distance with a very longor practically no twist. The closely twisted portions may then be cut apart at some point between for use.

An object of the present invention is to pro- 25 vide a method of and an apparatus for intertwisting two or more strands with or without a core strand in such fashion as to produce a repeated sequence of two or more portions having lays of diflerent pitch. so With the above and other objects in view one embodiment of the invention comprises means to advance longitudinally a plurality of strands and rotary means to intertwist' the strands in combination with means to cyclically vary in pre- 5 determinable fashion the ratio of the linear speed of longitudinal advance of the strands to the angular speed of the rotary twisting means.

Other objects and'features of the invention will appear from the following detailed description of one embodiment thereof taken in connection with the accompanying drawings in which the same reference numerals are appended to identical parts in the several figures and in which Fig. 1 is a diagrammatic representation of an apparatus constructed in accordance with the invention;

Fig. 2 is an enlarged view in central longitudinal section of the compacting device;

Fig. 3 is an end view of the rotary member thereof; v e s Fig. 4 is a view of one product of the apparatus of Fig. 1;

Fig. 5 is a right hand side enlarged elevation is of the commutator of the apparatus of Fig. 1;

Fig. 8 is a sectional view thereof on the line 6-4 of Fig. 5;

Fig. 7 is a view similar toFlg. 1 of a modified, form of apparatus. and

1'18. 8 is a view of a product of'the apparatus of Fig. 7. .7

The apparatus disclosed mm. 1 comprises a core supply", a rotatable conductor supply and and a driving and speed control unit, ll.

The core supply device 2. maybe any approved I and well'known means to support a spool or reel 2| having. a supply of a core strand ll-wound thereon. The device itself is not shown .in detail as many such are well known in the art.

The unit II comprises a disk shaped'base 3i mounted in any suitable fashion, not shown, to be rotatable about its axis. Two conductor strand supply reels 3! and 18 are mounted on the base ii to be rotatable thereon and to revolve therewith about the axis thereof. These reels carry supplies of insulated conductor strands II and II respectively, which are combined by the apparatus into a compound strand l4 in which the strands ii and I! are twisted together about the substantiallystraight strand l0. A'cylindrical male twisting member .34 having a conical head 3! and an axial bore I6 is mounted rigidly and coaxially on the base 31 which has a central aperture to communicate with the bore 36. The conical outer face of the head ll is also formed with a pair of radial grooves 31 and ll. The strand ll passes through the bore 36 and is met at the apex of the head 35 by the. strands II and I! which lie in the grooves 31 and 38 respectively. .A dragdevice 29, of any appropriate construction, acts to retard rotation of the disk Ii.

' A generally cylindrical or prismatic female twisting member 40 is rigidly and immovably 40 supported by any appropriate ,means not shown to be coaxial with the member 34 and to receive the conical head II in a correspondingly conical recess 4| formed in its end. An axial-bore 42 in the member 40 forms in efl'ect an extension of the rolls grip the compound strand between them to prevent it from rotating under the twisting eflect at the apex of the head 3|.

The capstan and take-up unit Il may be of any well known and approved construction.

The drive and control unit 80 comprises aseries wound D. C. motor CI to drive the twisting unit 30, a solenoid actuated brake device 62 to stop the twisting unit, a constant speed motor I to drive the capstan at invariant speed and thus to advance the core strand II and its associated conductor strands II and It at constant linear speed through the apparatus, an adjustable reduction gear 64 driven by the motor 83 and driving a control shaft I.

The motor 63 is connected directly across the main input power lines Ill and III and thus runs continuously so long as the main control switch I03 is closed. One terminal of the motor BI is directly conected to the line III. The other is connected through an adjustable rheostat 86 and a wire 61 to a contact arm 08 mounted on and rotatable with the shaft ll. Opposite the contact arm 68 andcoaxial therewith is a stationary disk 69 (Figs. 5 and 6) oi. insulating material having secured to the face thereof next to the contact arm a plurality (here twelve) of segmental metallic contacts 10, insulated from each other by the plate and by air gaps. The end of the arm Bl is formed to wipe over the segments It as the shaft turns. I

On the other face of the disk 69 is a concentric plurality (here five) of metallic rings H. Holes 12 are bored along the central radius of each segment 10 through each segment and each ring. A metallic pin I3 may be thrust into the appropriate one of these holes to connect any given segment with any given ring, and by using a plurality of pins 13 the segments and rings may be interconnected in any desired manner; A resist-- ance 14 has one end II connected to the outermost ring I i and its other end I. connected to the innermost ring I l. Slidingcontacts 'l'l, two less in number than the number of rings II are connected in sequence respectively to the intermediate rings H between the innermost and outermost rings H.

The terminal II is also connected through the solenoid 62 to the line "II, and to one side of a tilting switch It the other side of which is directly connected to the line I02. The switch 18 is positively operated to open and to close respectively by cams I9 and 80 adiustably mounted on the shaft 65.

Assumingnow that the machine is in the general position shown in Fig. i, let the main switch I03 be closed. The motor 63 then drives the capstan and take-up 50 at constant speed propelling the strand II at constant linear speed thereof to the right. The switch 18 being open current can pass neither to the motor 8| nor through the solenoid of the brake II. The disk 3i therefore is not now driven by the motor 6i and is additionally held stationary by the brake 62. Hence a length of the strands I0, Ii and I2 isdrawn from the member 40 in an untwisted state as shown at It in Fig. 4.

The cam 18 releases the switch 18 which is now closed by the cam 80. Current then flows from the line I02 to the terminal 15 and thence through the switch 18 to energize the solenoid of the brake 62 and back to the line ilil. Hence the brake releases the disk 3|. At the same time current flows from the terminal 15 into the resistance H and thence to the several rings I I. Various pins 11 being in the positions shown in Figs. 5 and 6,

current will pass from the outermost ring Ilinto the segments 10 indicated at A-B, 3-0 and 0-D, and from segment A-B into the contactor commutator arm .8, whence it flows via wire 81 and rheostat It to motor I and so to the line Ill. The motor 6| thereupon begins to drive the disk 3| at a constant and relatively high rate of speed against the action of the drag 2!, and so causes the conductors II and I! to twist about the core ill into the relation shown in Fig. 4 at It. The speed of the motor II at this time is not affected by the resistance 14 but is fixed by the adjustable rheostat .6 at a value which in connection with the constant speed of the motor '3 driving the unit it will produce the extremely short pitch of twist shown at I.

This state of aifairs will continue while the contact arm I sweeps over the three segments 10 from A to D. The next two segments II from DtoEandfromEtoFareconnectedbypins I! to the second ring II from the outside and not to any other ring. This causes current to pass from terminal I5 -through the first section of the resistance I4 and the first sliding contact II to the second ring Ii and thence to the D-F segments 10 and so to the motor". The resistance thus cut into the motor circuit causes the latter to slacken speed and to allow the twisting device to slow a trifle under the eifect of the drag 20.

Since the speed of longitudinal advance of the strands remains unchanged as the motor 03 is not affected. the result is that the next length of strand I will show a somewhat longer pitch, as indicated at H in Fig. 4, until the contact arm ll leaves the E-F segment 1|.

The F-G segment II is connected by a pin II to the next to the last ring II and hence while the contact arm sweeps over this segment 10, the first three sections of the resistance 14 are cut into the twisting head motor circuit and the twisting speed correspondingly reduced to'jproduce a relatively long pitch section II of strand.

In analogous fashion the sections from G to. L in Fig. 4 are produced as the contactarm sweeps over the segments 10 from G to L in Fig. 5. Segments 10 from L to M and M to A are not connected to any ring ll, hence while the contact arm 68 sweeps over these segments no current can pass to the motor ii and an untwisted section I! of strand is produced, after which the entire cycle or operations is automatically repeated until the main switch III! is opened.

For the above mode of operation, the cams ll and 80 are set to open and close the switch II as the contact arm n enters segment Ill from L to M and leaves segment ID from M vto A, so that for this mode of operation the switch is supererogatory. However to produce the product shown in Fig. 8, pins I! may be inserted to connect all the segments 10 with one and the same switch I8 closed and interconnecting all the seg- 1 ments appropriately with the rings, a product may beproduced analogous to that shown in Fig. 4 but without any parallel portion.

It will be noticed in" Fig. 4 that in the open lay parts of the strand I from D to L, the two strands II and I2 lie closely abutted together with a spiral open space between the turns of the double helix thus formed, and this in spite of the fact thatthe twisting or serving head 35 leads the cover strands II and I2 to the core strand I from symmetrically opposite sides of the latter. Because of the inherent variability'of material things, the supplies 32 and 33 will difier in the resistance which they oifer to permitting the cover strands II and I 2' to be drawn 01!. Hence the opposed tensions of the strands- II and I2 on the strand I0 at the twisting point between the outlet of the bore 30 and the entrance to the bore 42 will be slightly unequal in practice and the actual twisting point will be drawn a trifle out of line (either up or down in Fig. 2 according as the tension of strand II is a little greater or less than that of strand I2). Because of this fact, the two strands II and I2 are served on the core I0 as shown instead of dividing the longitudinal space along the core l0 evenly between them.

For the manufacture of capacitance balancing units it may be an advantage to have the two conductors thus closely-juxtaposed throughout their coiled length. However, if for other purposes it be desired'to distribute the turns 'of the conductors along the core with equal interspaces, this may obviously be accomplished by making the bore 42 of such diameter, particularly at the entrance of the bore, as to fit the strand' I0 so closely as not to permit any displacement of the winding'point. Then the conductor strands II and I2 will be served on thecore strand I0 in a symmetrical fashion to form equi-spaced coils. In any event the successful operation of the apparatus disclosed is materiallyenhanced by the close and accurate control of the several strands,

both individually and collectively, immediately before, at, and immediately behind the winding point, exercised by the members 35 and 0|, the grooves 31 and 30, the bores 30- and 42, and the rolls l5 and 41. Suchcontrol exercised by such or equivalent apparatus appears to be an important auxiliary to the general procedure and apparatus. a

Furthermore, if the supplies 02 and 33 be mounted on the disk 3| side by side instead of diametrically opposite, and if the grooves 31 and be positioned correspondingly near together instead of diametrically opposite, the close apposition of the turns of the two cover strands II and I2 on the core strand I0 with interspaces between the twin turns will be positively enforced. Also more than two supplies may be mounted on the disk 3|, symmetrically or unsymmetrically spaced therearound, and a corresponding number of guide grooves (such as 31 and 30) may be made in the head mam any reasonable number of cover strandsmay be served on the core strand with their respective turns distributed along the core'strand in any desired predetermined iashion.

The apparatus shown in Fig. 7 is a simpler form adapted to produce only the type of product shown in Fig. 8. Here the units 20 and 30 are the same as before. The capstan and take-up unit I has the same function as the unit 50, but the capstan is here shown as a pair of rubber faced rolls or sheaves |5| and I52, the ,roll Ill being driven by the motor 03, and the two rolls pressing the strand I4 between them to draw it along. The unit 00*might however be equally well substituted for the unit I00.

0n the side of the sheave I02 and insulated therefrom in any suitable manner is rigidly mounted a partial slip ring I 10 anda complete slip ring I'll connected by a conductor I13. A stationarily supported brush I00 is connected to the line I02 and wipes over the ring I10. A similar brush I10 wipesover the ring "I and is connected by a wire 01 to one terminal of the solenoid of the brake 62 and to one. terminal of the motor 0 I. The other terminals of the brake solenoid and of the motor 0| are connected to the line IN. The motor 03,. as before, is connected directly to the lines |0| and I02. I

With the parts in the position shown in Fig. 7, if the main switch I03 be closed, the motor 00 starts at once to draw the strand I4 along toward the right at constant linear speed and to rotate the rings I10 and Ill clockwise.

ductor I13, ring HI and wire 01 to the solenoid of the brake 02 and to the motor 0|, and thence I10 corresponds to the point Q of Fig. 8. At this time the circuits of the brake solenoidand of the, motor 0| are broken by the ring I10 leaving the brush I00. The motor 0| and twisting unit 30 are stopped by the brake 02, and this state of Current flows from the line I02 via brush I00, ring I10, con

aflairs continues until the leading end of the ring I I10 again reaches the brush I00. During this interval an untwisted or parallel portion I0'of the strand I4 is produced. The above process then repeats itself cyclicallyas long as the switch I03 is closed.

Itwill be clear from the above disclosures that importantly characteristic features of the invention are the controlled variation of the ratio of the speed of the linear advance of the strand I4 to the angular speed of the unit 30 and in particular the arrangement, and methodinwhich the linear speed of the strands is held constant while the angular speed of the twisting is cyclically varied.

The above disclosed embodiments of the invention are illustrative only and may be modified and departed from in many ways without departing from the spirit and scope of the invention as pointed .out in and limited only by the appended claims.

What is claimed is:

1. A method of combining strands which comprises the steps of advancing a plurality of strands longitudinally at constant linear speed, and intertwisting the strandstogether, while varying the angular speed of twisting whereby the pitch of twist of the intertwisted strands may be varied from a short pitch to a pitch of substantially any magnitude. g

2. A method of combining strands which coniprises the steps of advancing a plurality of strands longitudinally at constant linear speed, and intertwisting the strands together, while whereby the pitch of twist of the intertwisted strands may be cyclically varied from a short pitch to a pitch of substantially any magnitude.

3. In a strand handling apparatus, means to advance a plurality of strands longitudinally at constant linear speed, and rotary means to intertwist the strands together, in combination with means to vary the angular speed of the twisting means whereby the pitch of twist of the intertwisted strands may be varied from a short pitch to a pitch of substantially any magnitude.

4. In a strand handling apparatus, means to advance a plurality of strands longitudinally at constant linear speed, androtary means to intertwist the strands together, .in combination with means to cyclically vary the angular speed of the twisting means whereby the pitch of twist of the intertwisted strands may be cyclically varied from a short pitch to a pitch of substantially any magnitude. 5. In a strand handling apparatus, a stationary core supply, a rotatable support, a strand supply mounted on the support to be revolved thereby, a twisting member mounted on the support to be rotated thereby to twist a strand drawn from the strand supply about a core drawn from the core supply, a product advancing means to advance the combined core and strand, a,constantspeed motor to drive the advancing means, a motor to drive the support, and a commutator device to vary the speed of the support driving motor.

6. In a strand handling apparatus, a stationary core supply, a rotatable support, a strand supply mounted on the support to be revolved thereby, a twisting member mounted on thesupport to be rotated thereby to twist a strand drawn from the strand supply about a core drawn from the core supply, a product advancing means to advance the combined core and strand, a constant speed motor to drive the advancing means,.a motor to drive the support, and a commutator device to cyclically vary the speed of the support driving motor.

7. In a strand handling apparatus, a stationary core supply, a rotatable support, a strand supply mounted on the support to be revolved thereby, a twisting member mounted on the support. to be rotated thereby to twist a strand drawn from the strand supply about a core drawn from the core supply, a product advancing means to advance the combined core and strand, a constant speed motor to drive the advancing means, a motor to drive the support, and a commutator device driven by the constant speed motor to vary the speed of the support driving motor.

8. In a strand handling apparatus, a stationary core supply, a rotatable support, a strand supply mounted on the support to be revolved thereby, a twisting member mounted on the support to be rotated thereby to twist a strand drawn from the strand supply about a core drawn from the core supply, a product advancing means to advance the combined core and strand, a constant speed motor to. drive the advancing means, a motor to drive thesupport, and a commutator device driven by the constant speed motor to cyclically vary the speed of the support driving motor.

9. In a strand handling apparatus, a stationary core supply, a rotatable support, a strand supply mounted on the support to be revolved thereby, a twisting member mounted on the support to be rotated thereby to twist a strand drawn from the strand supply about a core drawn from the core supply, a product advancing means to advance cyclically varying the angular speed of twisting the combined core and strand, a constant speed motor to drive the advancing means, a motor to drive the support, a commutator device driven by the constant speed motor to vary the speed of the support driving motor, and an adjustable-speed transmission device between the constant speed motor and the commutator device.

10. A method of combining strands which comprises the steps of advancing a core strand longitudinally past a winding point, leading a plurality of cover strands to the core strand at the winding point, revolving the cover strands about the core strand to be wound thereon, and controlling lateral displacement of the winding point to control the relative distribution of the cover strands on the core strand.

11. A method of combining strands which comprises the steps of advancing a core strand longitudinally past a windingpoint, leading a plurality of cover strands to the core strand at the winding point, revolving the cover strands about the core strand to be woundthereo'h, varying the ratio of the linear speed of the core strand to the angular speed of the cover strands at the winding point to vary the lay of the cover strands on the core strand, and controlling lateral displace: ment of the winding point to control the relative distribution of the cover strands on the core strand.

12. A method of combining strands which com-, prises the steps of advancing a core strand longitudinally past a winding point at constant linear speed, leading a plurality of cover strands to the core strand at the winding point, revolving the cover strands about the core strand to be wound thereon, varying the angular speed of the cover strands to vary the lay of the cover strands on the core strand, and controlling lateral displacement of the windingpoint to control the relative distribution of the cover strands on the core strand.

13. In a strand handling apparatus having means to advance a plurality of strandslongitudinally, and means to intertwist the strands together, in combination with means to vary the ratio of the linear speed of advance of the strands to the angular speedof the twisting means, a twisting device comprising a member having a working face thereon and formed with a cover strand guiding groove in the working face and with a core strand guiding bore intersecting the working face, and a second member having a working face thereon complementary to the first named working face to retain in place a cover strand positioned in the said groove and the second-member also being formed with a, bore positioned coaxially with the first named bore to receive a combined core strand and cover strand, one of the two members being rotatable-relatively to the other about the common axis of their two bores to serve the cover strand on the core strand.

14. In a strand handling apparatus having means to advance a plurality of strands longitudinally, and means to intertwist the strands together, in combination with means to vary the ratio of the linear speed of advance of the strands to the angular speed of the twisting means, a twisting device comprising a member having a working face thereon and formed with a cover strand guiding groove in the working face and with a core strand guiding bore intersecting the working face, and a second member having a working face thereon complementary to the first named working face to retain in place auasee a cover strand positioned in the said groove and the second member also being ,formed with a bore positioned coaxially with the first named bore to receive a combined core strand and cover strand, the first named member being rotatable relatively to the second member about the common axis of their bores to serve the cover strand on the core strand.

15. In a strand handling apparatus having means to advance a plurality of strands longitudinally, and means to intertwist the strands together, in combination with means to vary the ratio of the linear speed of advance of the strands to the angular speed'of the twisting means, a twisting device comprising a member having a working face thereon and formed with a cover strand guiding groove in the working face and with a core strand guiding bore intersecting the working face, and a second member having a working face thereon complementary to the first named working face to retain in place a cover strand positioned in the said groove and the second member also being formed with a bore positioned coaxially with the first named bore to receive a combined core strand and cover stand, one of the two members being rotatable relatively to the other about the common axisof their two bores to serve the cover strand on the core strand, and the bore ofthe second member being substantially of the same diameter as the served cure to prevent lateral displacement of the winding point.

16. In a strand handling apparatus having means to advance a plurality of strands longitudinally, and means to intertwist the strands together, in combination with means to vary the ratio of the linear speed of advance of the strands to the angular speed of the twisting means, a twisting device comprising a member having a working face thereon and formed with a cover strand guiding groove in the working face and with a core strand guiding bore intersecting the working face, and a second member having a working face thereon complementary to the first named working face to retain in place a cover strand positioned in the said groove and the second member also being formed with a bore positioned coaxially with the first named bore to receive a combined core strand and cover strand, one of the two members being rotatable relatively to the other about the common axis of their two bores to serve the cover strand on the core strand, and the bore of the second member being substantially larger than the diameter of the served core whereby the winding point may be laterally displaced.

17. In a strand handling apparatus a serving head comprising a member having a working face thereon and formed with a cover strand guiding groove in the working face and with a core strand guiding bore intersecting the working face, a second member having a working face thereon complementary to the first named working face to retain in place a cover strand positioned in the said groove and the second member also being formed with a bore positioned coaxially with the convex conigal head formed with a strand guide groove therein and having an axial bore coaxial with the conical surface, and a fixed member having a concave conical surface complementary to the said conical head and juxtaposed thereto to retain a strand positioned inthe'said groove therein and having an axial bore coaxial with the concave conical surface and with the first named bore.

19. In a strand handling apparatus a serving head comprising a rotatable member having a convex conical head formed with a strand guide groove therein and having anaxial bore'coaxial with the conical surface, a fixed member having a concave conical surface complementary to the said conical head and-juxtaposed thereto to retain a strand positioned in the said groove therein and having an axial bore coaxial with the concave conical surface and with the first named bore, and means in thebore of the fixed member to prevent rotation relative to the fixed member of a strand passing through the bore of the fixed member.

20. In a strand handling apparatus, means to advance a plurality of strands longitudinally, rotary means to intertwist the strands together, means to drive the advancing means at constant speed, means independent of said driving means to drive the intertwisting means, and means to vary the speed of the last named driving means.

21. In a strand handling apparatus, means to advance a plurality of strands longitudinally, rotary means to intertwist the'strands together, means to drive the advancing means at constant speed, means independent of said driving means to drive the intertwiating means, and means to vary the speed of the last named driving means without aflecting the speed of the first named driving means.

22. In a strand handling apparatus, a stationary core supply, a rotatable support, a strand supply mounted on the support to be revolved thereby, a twisting member mounted on the support to be rotated thereby to twist a strand drawn from the strand supply about a core drawn from the core supply, a product advancing means to advance the combined core and strand, a constant speed means to drive the advancing means, means to drive the support, and means to vary the speed of the support driving means.

23. In a strand handling apparatus, a stationary core supply, a rotatable support, a strand supply mounted on the support to be revolved thereby, a twisting member mounted on the support to be rotated thereby to twist a strand drawn from the strand supply about a core drawn from the core supply, a product advancing means to advance the combined core and strand, a constant speed motor to drive the advancing means, a motor to drive the support, and a device to vary' the speed of the support driving motor.

24. In a strand handling apparatus, a rotatable support, a plurality of strand supplies mounted on the support to be revolved thereby, a twisting member mounted on the support to be rotated thereby to intertwist strands together drawn from the plurality of supplies, a product advancing, means to advance the intertwisted strands, a constant speed means to drive the advancing means, means independent of said driving means to drive the support, and means to vary the speed of the support driving means.

25. In a strand handling apparatus, a rotatable support, a plurality of strand supplies mounted on the support to be revolved thereby, a twisting member mounted on the support to be rotated thereby to intertwist strands together drawn from the plurality of supplies, a product advancing means to advance the intertwisted strands, a constant speed means to drive the advancing means, means independent of said driving means to drive the support, and means to cyclically vary the speed of the support driving means.

26. In a strand handling apparatus, a core strand supply, a plurality of cover strand supplies, means to lead the cover strands to the core strand at a winding point, means to revolve the core strands about the cover strand to be wound thereon, means to advance the combined strands from the winding point, and means to control lateral displacement of the strands at the winding point for controlling the relative distribution of the cover strands on the core strand.

27. In a strand handling apparatus, a core strand supply, a plurality of cover strand supplies, means to lead the cover strands to' the core strand at a winding point, means to revolve the core strands about the cover strand to be wound thereon, means to advance the combined strands at constant linear speed from the winding point, means to vary the angular speed of the cover strands about the core strand to vary the lay of the cover strands ,on the core strand, and means to control lateral displacement of the strands at the winding point for controlling the relative distribution of the cover strands-0n the core strand.

HERBERT S. KEATING. 

